The specifications for the pressure, the flow rate, and the engine rpm may vary with attachment types and/or suppliers. It is very important to follow the specifications of the supplier. Failure to follow the specifications of the supplier could result in poor performance of the attachment.
It is important to record the appropriate engine speed when the specifications are obtained. For best performance, use this recorded engine speed to operate the attachment.
Test
| Required Tools | |||
|---|---|---|---|
| Part Number | Part Description | Quantity | |
| 4C-9910 | Flow meter | 1 | |
| 6K-6307 | O-ring seal | 2 | |
| 8C-9026 | Adapter | 2 | |
| 7M-8485 | O-ring seal | 10 | |
| 4C-6482 | Nipple assembly | 4 | |
| 4C-6481 | Coupler assembly | 4 | |
| 4C-8767 | Coupling | 4 | |
| 5P-1010 | Sleeve | 4 | |
| 5P-0201 | XT-5 Hose ( 3.5 m (12 ft) ) |
2 | |
| 6V-8635 | Adapter | 2 | |
| 5K-9090 | O-ring seal | 2 | |
| 4I-6141 | Coupling | 2 | |
| 8T-0861 | Pressure gauge | 1 | |
| 6V-3989 | Unvalved nipple | 1 | |
| 6V-4143 | Coupler assembly | 2 | |
| 6V-3014 | Hose assembly | 1 | |
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| Illustration 1 | g00241207 |
Flow meter tool layout (3) 4C-9910 Portable hydraulic tester (flow meter) (4) 6K-6307 O-ring seal (5) 8C-9026 Adapter (6) 7M-8485 O-ring seal (7) 4C-6482 Nipple assembly (8) 4C-6481 Coupler assembly (9) 4C-8767 Coupling (10) 5P-1010 Sleeve (11) 5P-0201 Hose (12) 4I-6141 Coupling (13) 5K-9090 O-ring seal (14) 6V-8635 Adapter (15) 8T-0861 Pressure gauge (16) 6V-3989 Unvalved nipple (17) 6V-4143 Coupler assembly (18) 6V-3014 Hose assembly (19) Pressure tap (rear pump delivery pressure) (20) Rear pump (21) Supply line (22) Return line | |
| NOTICE |
|---|
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates. |
- Position the machine on level ground.
- Stop the engine.
- Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release" .
- Assemble the tools in accordance with the flow meter tool layout. Refer to Illustration 1 .
- Connect supply line (21) to the inlet port (1) of flow meter (3) .
 | |
| Illustration 2 | g00536901 |
Flow meter (1) Inlet port (2) Outlet port (3) Flow meter (23) Multitach (24) Flow meter valve | |
- Connect return line (22) to the outlet port (2) of flow meter (3) .
- Connect a 60000 kPa (8700 psi) pressure gauge (15) to pressure tap (19) .
 | |
| Illustration 3 | g00379155 |
Pump compartment (19) Rear pump pressure tap | |
- Install multitach (23) on the engine.
- Start the engine.
 |
To prevent personal injury or equipment damage from failure of the hydraulic test equipment or associated circuit components because of blocked pump flow, make sure that the test equipment valves are fully open before starting the engine. |
 |
- Place the machine controls at the following settings: Power Mode, engine speed dial "10" and AEC switch OFF .
- Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F) .
- Depress the auxiliary pedal and hold the auxiliary pedal for the remainder of the test.
- Slowly, turn flow meter valve (24) clockwise until the pressure at pressure tap (19) reaches the pressure specification that is recommended by the supplier of the attachment.
- Record the flow measurement and the engine speed (rpm) in Table 2 .
- Fully, rotate flow meter valve (24) clockwise in order to stop the flow through the flow meter.
- Read the pressure at pressure tap (19) . This reading will be the pressure setting for the line relief valve (27) in the attachment circuit.
Show/hide table
Table 2 Test Results Engine speed (rpm) Flow measurement L/min (US gpm) Line relief valve pressure setting kPa (psi) Oil Temperature °C (°F)
- Slowly, turn flow meter valve (24) counterclockwise to the OPEN position.
|
To prevent personal injury and/or equipment damage from failed lines or components while the hydraulic test equipment is returned to the open flow position, slowly open the hydraulic test equipment valve while monitoring the pump flow. If pump flow does not increase as the valve is opened, shut the engine off and determine what is preventing the pump from upstroking. |
|
Adjust
If the flow measurement does not meet the specification of the supplier, perform the following steps.
- Stop the engine.
- Release the pressure in the hydraulic system. Refer to Testing And Adjusting, "Hydraulic System Pressure - Release" .
- Allow the hydraulic oil to cool.
- Remove plug (26) , spring (28) , and relief valve (27) from valve block (25) .
 | |
| Illustration 4 | g00378913 |
Valve (25) Block (26) Plug (27) Relief valve (28) Spring | |
- Remove seat (29) , valve (30) and spring (31) . If the flow measurement was too low, remove an appropriate number of shims (32) . If the flow measurement was too high, add an appropriate number of shims (32) .
5J-6153 Shim
- Thickness ... 0.07 mm (0.0028 inch)
- Change of relief pressure for each shim ... 590 kPa (86 psi)
6J-8696 Shim
- Thickness ... 0.05 mm (0.0020 inch)
- Change of relief pressure for each shim ... 420 kPa (60 psi)
Note: It may not always be possible to reach the specified relief pressure setting at the flow rate that is specified by the supplier.
- Thickness ... 0.07 mm (0.0028 inch)
 | |
| Illustration 5 | g00378914 |
Relief valve (27) Relief valve (29) Seat (30) Valve (31) Spring (32) Shims | |
- Install the remaining parts in reverse order of removal. Use the following torques:
Torque for plug (26) ... 215 ± 25 N·m (159 ± 18 lb ft)
Torque for seat (29) ... 215 ± 25 N·m (159 ± 18 lb ft)